title: Is the naphthalene sulfonate H-acid biodegradable in mixed microbial cultures under aerobic conditions?
abstract: Synthetically prepared wastewater originating from the H-acid (4-Amino-5-hydroxy-2,7-naphthalene disulfonic acid) manufacturing process was subjected to respirometric analysis for evaluating the level of achievable biodegradation in the presence of this commercially important azo dye precursor. For this purpose, H-acid was mixed with synthetic substrate having the same characteristics as sewage at a concentration and composition being typical for H-acid manufacturing wastewater. Experimental results indicated that H-acid was not biodegradable under activated sludge treatment conditions even after prolonged acclimation periods. The results were also confirmed by model evaluation of oxygen uptake rate profiles. H-acid also did not inhibit the biodegradation of synthetic sewage but accumulated as soluble inert COD in the treated wastewater.
authors.affiliation: Environmental Engineering Department, Istanbul Technical University, ITU, Insaat Fakultesi, 34469 Maslak, Istanbul, Turkey.
authors.forename: T
authors.initials: T
authors.lastname: Olmez-Hanci
authors.forename: I
authors.initials: I
authors.lastname: Arslan-Alaton
authors.forename: D
authors.initials: D
authors.lastname: Orhon
authors.forename: O
authors.initials: O
authors.lastname: Karahan
authors.forename: E Ubay
authors.initials: EU
authors.lastname: Cokgor
authors.forename: G
authors.initials: G
authors.lastname: Insel
mesh_terms: D000332:Aerobiosis; D001673:Biodegradation, Environmental; D018533:Biomass; D009281:Naphthalenes / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism
chemical_list: D009281:Naphthalenes; D010100:Oxygen